LORD TFD Steering Units

®
LORD TFD Steering Units
FOR STEER-BY-WIRE SYSTEMS
Steer-by-Wire Systems in Industrial
and Off-Highway Equipment
Electro-hydraulic and fully-electric Steer-by-Wire
(SbW) systems are gaining favor over traditional
mechanical and hydraulic steering systems. Vehicles
with SbW systems tend to consume less energy,
reducing the cost of ownership and improving
environmental impact. In SbW systems, there is no
mechanical connection between the steering wheel
and road wheels, which has challenged OEMs in
providing the operator with a high qualilty steering
feel. In response to this challenge, LORD offers a
line of Tactile Feedback Device (TFD) steering units.
2
WHAT IS A TFD STEERING UNIT?
The TFD steering unit is a key component of fullyelectric and electro-hydraulic SbW systems.
These devices provide an integrated solution that
combines bearing support, steering position sensing,
communication and continuously variable resistive
steering torque, delivering high-fidelity tactile feedback
and maximum control to the operator.
LORD Corporation is a pioneer for SbW steering units
since 1999, when the first device began production in
a forklift truck application. The LORD TFD steering unit
is maintenance free and will never require inspection
or adjustment during the expected service life. There
are very few moving parts in the design which greatly
enhances durability. With more than 300,000 devices
in service today, LORD Corporation has a long history
of providing reliable and safe devices for Industrial
and Off-Highway equipment.
3
HOW DOES A TFD STEERING
UNIT WORK?
The TFD steering unit is typically mounted below the vehicle
steering wheel. As the operator turns the steering wheel, the
hall-effect steering sensor detects and transmits the steering
position to the vehicle steering controller. The steering controller
uses information from a variety of vehicle inputs to determine the
preferred steering response.
The steering response can be programmed for partial or multiple
rotations, to be speed sensitive, and to generate end-stop control,
position detents and more. Integration with other devices and
technologies such as electric motors, GPS and vision systems can
provide sophisticated hybrid steering control.
These devices provide an integrated solution for electric
and electro-hydraulic Steer by Wire systems.
Torque feedback to the operator is generated
through our proprietary “Direct Shear Mode”
design in which a rotor attached to a shaft shears
magnetically responsive (MR) material against a
fixed stator. As the current commanded by the
vehicle steering controller to the TFD steering unit
changes, a low-power (0-1 amp) coil generates a
magnetic field that instantaneously changes the
properties of the MR material and the subsequent
torque feedback.
With torque feedback independent of speed and
temperature, a wide variety of applications can
benefit from the smooth and quiet steering feel.
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BENEFITS OF LORD TFD STEERING UNITS
IMPROVED STEERING FEEDBACK
PERFORMANCE
•
•
CONFIGURATIONS (2, 3 OR 4
STEERING FEEDBACK BASED
OUTPUTS)
CONDITIONS
SMOOTH STEERING TORQUE
INDEPENDENT OF VEHICLE SPEED
AND TEMPERATURE
•
FRICTION BRAKES)
•
•
OUTPUTS
•
PROTECTED FROM EMC
•
SIL2/3 SAFETY RATING
NO ELECTRIC MOTOR
INCREASED DESIGN FLEXIBILITY
•
INCREASED EASE OF OFF-ROAD
MANEUVERABILITY
IMPROVED ACCURACY AT ON-ROAD
SPEEDS
•
LOW POWER CONSUMPTION
•
FAST RESPONSE TIME
EXTENSIVE PORTFOLIO OF
STANDARD AND CUSTOMIZED
“COGGING” FEEL
•
ANALOG (V) AND/OR DIGITIAL (PWM)
NO “STICK SLIP” AT LOW
SPEEDS (COMMON WITH
•
MULTIPLE NON-CONTACT SENSOR
PROGRAMMABLE RESISTIVE
ON EQUIPMENT OPERATING
•
RELIABLE CONTROL SIGNALS
SOLUTIONS
•
ROBUST, EASY-TO-INSTALL,
COMPACT DESIGN
•
IMPROVED STEERING ERGONOMICS
FOR THE OPERATOR
•
NO MAINTENANCE REQUIRED
Current Applications: Industrial Lift Trucks, Agriculture &
Construction Equipment, Electric Vehicles, Marine.
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TFD Steering Unit Product Portfolio
LORD Corporation has a diverse portfolio of TFD steering units to satisfy a variety of customer requirements. Our portfolio includes
devices capable of producing 5Nm and 12Nm of resistive steering torque.
5NM PRODUCT SPECIFICATIONS
5NM DEVICES
The adoption of smaller steering wheels has increased as many Industrial
and Off-Highway Equipment OEMs consider more innovative and flexible
Category
Specification
Product Weight
1.3 kg (2.9 lbs)
steering interfaces. To meet the various needs of these applications,
Rated Torque @ 1A
LORD has developed a standard product line of 5Nm devices which
Of f -State Torque @ 0A
include the following features:
2-Channel Dual-Redundant, Non-Contact, Hall Effect Steering Sensor
•
Sensor output (three options)
Standard digital (PWM) multi-rotational code
•
Analog code suitable for controllers with limited digital I/O
•
Analog multi-rotational code with no discontinuities in the
signal
Flat
•
Cross-Drilled
20 AWG wire
•
200mm cable length
•
10 Ohm coil
Current Control
12 VDC
Coil Resistance
10 Ω nominal
1.5 A peak
ALIGNMENT FEATURE
Current (continuous)
1.0 A
Sensor Resolution
n12 bit
12
M8 X 1.25
Sensor Linearity
n3.2
•
50 Nm max (36.9 lb-f t)
Current (max)
4X n8.4
n12
Deutsch DTM04-6P connector
1500 N max (337 lbf )
Bending Moment Limit
ALIGNMENT FEATURE
•
-35 C to +80 C
(-31 F to +176 F)
Operating Temperature
200
n98
Shaft connection (two options)
180 rpm max
Axial Force Limit
•
•
<0.5 Nm (<0.4 lb-f t)
Operating Speed
•
•
5 Nm nominal (3.7 lb-f t)
+/- 1.2% Full Scale
12.45
Environmental
Protection
IP66
n12.65
80
o
95
o
8.6
17
13
27
CROSS DRILLED
SHAFT
51
Ø15
17
13
47
FLAT SHAFT
51
200
n98
4X n8.4
ALIGNMENT FEATURE
ALIGNMENT FEATURE
n12
n12
M8 X 1.25
n3.2
12.45
n12.65
80
o
Ø15
95
o
8.6
13
51
17
13
27
47
51
*DIMENSIONS ARE IN MILLIMETERS
6
17
12NM PRODUCT SPECIFICATIONS
12NM DEVICES
For applications with larger steering wheels, LORD has a standard 12Nm
Category
Specification
TFD steering unit to accomodate the higher steering torque.
Product Weight
2.7 kg (6.0 lbs)





10 Nm nominal (7.4 lb-f t)
Of f -State Torque @ 0A
<1.0 Nm (<0.75 lb-f t)
Operating Speed


Operating Temperature
Axial Force Limit



Rated Torque @ 0.8A

Bending Moment Limit




*DIMENSIONS ARE IN MILLIMETERS

-35 C to +80 C
(-31 F to +176 F)
1500 N max (337 lbf )
50 Nm max (36.9 lb-f t)
Current Control
12 VDC
Coil Resistance
11 Ω nominal
Current (max)
1.5 A peak
Current (continuous)
1.0 A
Sensor Resolution
12 bit
CUSTOMIZED SOLUTIONS
Sensor Linearity
LORD also designs and manufactures various customized 5Nm and
Environmental
Protection
12Nm devices, which are tuned to specific customer requirements. These
120 rpm max
+/- 1.2% Full Scale
IP66
designs may include the following unique features:
•
Quad-Redundant steering sensors
•
Housings
•
Shaft connections
•
Cable connections and length
•
Coil resistance
•
Sensor outputs
•
CAN-bus enabled devices
CAN-BUS COMMUNICATION
CAN-BUS SPECIFICATIONS
LORD has integrated CAN capability into our TFD steering unit
Category
product line, enabling more sophisticated steering algorithms using
Version
various vehicle inputs. Working closely with an OEM, LORD can use
Transceiver Type
CAN-bus communication to enhance the steering feel of a vehicle in
ways not possible with previous technology.
Speed
Message ID Size
Message Output Rate
Specification
2.0 B
High Speed
250 kbit/sec
(programmable)
11 or 29 bits
50 ms
(programmable 10 - 100 ms)
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LORD Global Presence
UNITED STATES
& CANADA
LATIN AMERICA
Regional Headquarters:
Cary, NC
Regional Headquarters:
Cary, NC
Key Products: Adhesives and coatings, industrial parts and assemblies,
motion and vibration control technologies, encapsulants, thermal
management compounds
Key Products: Adhesives and coatings, industrial parts, motion and
vibration control technologies
ASIA PACIFIC
EUROPE, MIDDLE EAST & AFRICA
Regional Headquarters:
Hong Kong
Regional Headquarters:
Geneva, Switzerland
Key Products: Adhesives and coatings, shock, motion and vibration
control technologies
Key Products: Adhesives and coatings, industrial parts and assemblies,
motion and vibration control technologies, encapsulants, thermal
management compounds
KEY MARKETS
AEROSPACE & DEFENSE
• Commercial Aircraft
• Military Aircraft
• Missile Systems
• Military Ground Vehicles
• Aftermarket
AUTOMOTIVE & INDUSTRIAL
ASSEMBLY
• Automotive Assembly
• Tier Component Assembly
• Aftermarket Collision Repair
• Electronics
• Industrial Assembly
“Ask Us How” are trademarks of LORD Corporation or one of its subsidiaries.
OIL & GAS & INDUSTRIAL
EQUIPMENT
• Oil and Gas
• Off-Highway Vehicles
• Truck & Bus
• Electronics
• Recreational & Marine
• Civil Engineering
LORD provides valuable expertise in adhesives and coatings, vibration and motion control, and magnetically responsive technologies. Our people work in collaboration with our customers to help them increase the value of their products. Innovative and
responsive in an ever-changing marketplace, we are focused on providing solutions for our customers worldwide ... Ask Us How.
LORD Corporation
World Headquarters
111 Lord Drive
Cary, NC 27511-7923
USA
LORD Corporation
Asia Pacific Regional Headquarters
Central Plaza, Suite 707, 18 Harbour Road,
Wanchai,Hong Kong
Customer Support Center (in United States & Canada)
+1 877 ASK LORD (275 5673)
www.lord.com
For a listing of our worldwide locations, visit LORD.com.
©2014 LORD Corporation Printed in USA KP PB8130 (Rev.0 4/14)
8
LORD Corporation
Europe Regional Headquarters
2, Chemin du Pavillon
CH-1218 Le Grand Saconnex
Geneva, Switzerland
+41 22 761 50 74
[email protected]

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